FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2507327716> ?p ?o ?g. }

• W2507327716 endingPage "55" @default.
• W2507327716 startingPage "35" @default.
• W2507327716 abstract "The increasing use of chelating reagent in analytical chemistry has created a demand for reliable values of equilibrium constants. Modern chelating ageants (TTHA: tetraethylentetraaminehexaacetic acid, TPHA : tetraethylenepentaamineheptaaceticacid) often contain a large number of coordination center, which means that in addition to normal chelates, they may form also mono- and diprotonated uni- nuclear and binuclear chelates. 1) pM and pH measurement (Stability constants) Ringbom's new method for the calculation of the stability constant of their chelate complexes by the measurement of pH and pM values has been reviewed. The method, which is based on a consistent use of side-reaction coefficient, is applicable to systems containing a large number of complexes. For example, the stability constants of mononuclear, binuclear and tinuclear silver complexes of TTHA are calculated. The constant KM, LMLL is given by eq. (1). log KM, LML=pM0.5+logαL(H)-logαML(H, OH)(1)The last term of eq. (1), log ML(H, OH), is zero if no acid or basic complex is formed by ML. The values of log KKM, L(ML)L are given in the forth column of Table 1 and plotted as a function of pH in Fig. 1.The formation of mixed complexes by metal ion and two competing ligand has been atracted interest in recent years. It was found that the 2: 1 HgTTHA chelate formed reacted with the buffer to form complexes of the type Hg2XA2hich X denotes the anion of TTHA and A-the secondary ligand (ammonia, irnidazole, urotropin). A method for the determination of the stability constants of mixed ligand complexes of metals is described. It is also interesting that the ion selective electrodes working as indicator electrode and lead (IV) acetate have been used in the TTHA titration. 2) Determination of a composition and structures of the chelates with TTHA or TPHA. On the basis of nuclear magnetic resonance (n.m.r.) spectroscopy, plausible solution structures are proposed. Resolution of structure of metal-chelates is the most important thing for analytical chemist. The preferable protonation sites determined in TPHA, TTHA, and metal-TPHA chelates by means of n.m.r. spectroscopy are summarized (Fig. 5 and 6). The possible instantaneous configurations (at various pH values) of the metal-TPHA complexes are also proposed (Fig. 7). For TTHAthe chemical shifts of the various proton are calculated by eq. (l4)-(2l). By the development in the esr theory for the determination of the distance between the copper ion in polynuclear species, two major structural possibilities presented by the binding sites of TTHA chelates are shown by the structures Fig. 8.a and 8.b (Cu-Cu bond length-5.5 Å). An interesting series of synthetic chelating reagents that illustrated as the analogs of NTA and EDTA in the behaviour is listed in Table 7. Inspection of these stability data shows that the stabilities increase up to the point (DTPA for Ni (II), Cu (II), Zn (II)) and decrease slightly (TTHA and TPHA), according to the number of donor group and negative charges of the ligands increase. This behavior is characteristic of the increasing the number of coordinate bonds formed, which reaches a limit, when the number of donor groups matches the characteristic coordination number of the metal ion. Cu (II), has the lower coordination numbers (i.e., 6), while the coordination numbers of Th (IV) are believed to be much high (i.e., 8). The fact is indicated that the increasing number of donor groups of the ligand beyond 6 greatly increases the stabilities of the chelates formed. .The stability constant of the 1: 1 metal (II)-TPHA normal complex is lower than the corresponding constants of the EDTA, DTPA, TTHA chelates by 3-4 logarithmic units. The following reasons are proposed:" @default.
• W2507327716 created "2016-09-16" @default.
• W2507327716 creator A5015296259 @default.
• W2507327716 date "1974-01-01" @default.
• W2507327716 modified "2023-10-01" @default.
• W2507327716 cites W1524110236 @default.
• W2507327716 cites W2043523262 @default.
• W2507327716 cites W2071480503 @default.
• W2507327716 cites W2162206048 @default.
• W2507327716 cites W2314201096 @default.
• W2507327716 cites W2507068343 @default.
• W2507327716 cites W2911486931 @default.
• W2507327716 cites W3146571636 @default.
• W2507327716 cites W610952342 @default.
• W2507327716 cites W623369259 @default.
• W2507327716 cites W630326032 @default.
• W2507327716 cites W2046210851 @default.
• W2507327716 doi "https://doi.org/10.5189/revpolarography.20.35" @default.
• W2507327716 hasPublicationYear "1974" @default.
• W2507327716 type Work @default.
• W2507327716 sameAs 2507327716 @default.
• W2507327716 citedByCount "1" @default.
• W2507327716 crossrefType "journal-article" @default.
• W2507327716 hasAuthorship W2507327716A5015296259 @default.
• W2507327716 hasBestOaLocation W25073277161 @default.
• W2507327716 hasConcept C10710636 @default.
• W2507327716 hasConcept C116569031 @default.
• W2507327716 hasConcept C145148216 @default.
• W2507327716 hasConcept C147789679 @default.
• W2507327716 hasConcept C168191866 @default.
• W2507327716 hasConcept C170493617 @default.
• W2507327716 hasConcept C178790620 @default.
• W2507327716 hasConcept C179104552 @default.
• W2507327716 hasConcept C185592680 @default.
• W2507327716 hasConcept C197404232 @default.
• W2507327716 hasConcept C2910097346 @default.
• W2507327716 hasConcept C40875361 @default.
• W2507327716 hasConcept C544153396 @default.
• W2507327716 hasConcept C55493867 @default.
• W2507327716 hasConceptScore W2507327716C10710636 @default.
• W2507327716 hasConceptScore W2507327716C116569031 @default.
• W2507327716 hasConceptScore W2507327716C145148216 @default.
• W2507327716 hasConceptScore W2507327716C147789679 @default.
• W2507327716 hasConceptScore W2507327716C168191866 @default.
• W2507327716 hasConceptScore W2507327716C170493617 @default.
• W2507327716 hasConceptScore W2507327716C178790620 @default.
• W2507327716 hasConceptScore W2507327716C179104552 @default.
• W2507327716 hasConceptScore W2507327716C185592680 @default.
• W2507327716 hasConceptScore W2507327716C197404232 @default.
• W2507327716 hasConceptScore W2507327716C2910097346 @default.
• W2507327716 hasConceptScore W2507327716C40875361 @default.
• W2507327716 hasConceptScore W2507327716C544153396 @default.
• W2507327716 hasConceptScore W2507327716C55493867 @default.
• W2507327716 hasIssue "4/6" @default.
• W2507327716 hasLocation W25073277161 @default.
• W2507327716 hasOpenAccess W2507327716 @default.
• W2507327716 hasPrimaryLocation W25073277161 @default.
• W2507327716 hasRelatedWork W1512877727 @default.
• W2507327716 hasRelatedWork W1972334381 @default.
• W2507327716 hasRelatedWork W2012412143 @default.
• W2507327716 hasRelatedWork W2077602737 @default.
• W2507327716 hasRelatedWork W2085632072 @default.
• W2507327716 hasRelatedWork W2319956700 @default.
• W2507327716 hasRelatedWork W2890812159 @default.
• W2507327716 hasRelatedWork W2950743036 @default.
• W2507327716 hasRelatedWork W3043386348 @default.
• W2507327716 hasRelatedWork W4252918231 @default.
• W2507327716 hasVolume "20" @default.
• W2507327716 isParatext "false" @default.
• W2507327716 isRetracted "false" @default.
• W2507327716 magId "2507327716" @default.
• W2507327716 workType "article" @default.